| 词条 | Gull River Formation |
| 释义 |
| name = Gull River Formation | image = Gull River formation1.jpg | caption = Gull River Formation exposed along the shore of Lake St. John, Ramara | type = Formation | age = Caradoc ~{{Fossil range|460.9|449}} | period = Sandbian | prilithology = Limestone, dolostone | otherlithology = Shale, sandstone | namedfor = Gull River | namedby = V. J. Okulitch | year_ts = 1939 | region = Ontario, New York | country = Canada, United States | coordinates = | unitof = Simcoe Group Black River Group | subunits = | underlies = Bobcaygeon Formation Coboconk Formation | overlies = Shadow Lake Formation | thickness = | extent = | area = | map = | map_caption = }} The Gull River Formation is a geological formation of Middle Ordovician age (Caradoc Stage), which outcrops in Ontario, Canada.[1] Lithologically, the formation is dominated by light grey to brown limestones and greenish gray dolostones with thin shale and sandstone interlayers.[2][3] References1. ^{{cite web|title=Gull River formation|url=http://weblex.nrcan.gc.ca/html/006000/GSCC00053006056.html|publisher=Natural Resources Canada|accessdate=January 4, 2015|date=January 9, 2008}} 2. ^{{cite book|last1=Armstrong|first1=Derek K.|last2=Dodge|first2=J. E. P.|title=Paleozoic Geology of Southern Ontario|date=2007|publisher=Ontario Geological Survey|isbn=978-1-4249-4526-9|pages=4|url=http://maps.niagararegion.ca/Metadata/md/DocumentUpload/2007-08-08%2014-44-38.pdf}} 3. ^{{cite book|last1=Armstrong|first1=D. K.|title=Paleozoic Geology of the Northern Lake Simcoe Area, South-Central Ontario|date=2000|publisher=Ontario Geological Survey|isbn=978-0--7778--9451--4|pages=9–15|url=http://www.geologyontario.mndmf.gov.on.ca/mndmfiles/pub/data/imaging/OFR6011/OFR6011.pdf}} See also{{Portal|Earth sciences|Ontario|Paleontology|Ordovician|Paleozoic}}
3 : Ordovician Ontario|Ordovician southern paleotemperate deposits|Ordovician southern paleotropical deposits |
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